136 MONOGRAPHIA 



33. NIRMUS HIATICUL^E. Denny. (Louse of the 

 Ringed Plover.) 



Plate XI. Fig. 10. 



Head, thorax, and lateral margin of the abdomen bright 

 fulvous yellow, shining and smooth, each segment of the 

 latter with a broad transverse lurid fascia in the centre. 



Head acuminate ; clypeus narrow and truncate, with a 

 bifurcate impression in front, a somewhat sigmoid im- 

 pressed line from the base of the antennae on each side 

 united on the vertex, occiput truncate ; antennae pale yel- 

 low, filiform ; prothorax transverse, channelled in the cen- 

 tre ; metathorax narrower than the head, posterior margin 

 acutely angular ; abdomen obovate, pale yellow-white, 

 lateral margin fulvous yellow, median line with transverse 

 lurid bands ; legs pale fulvous yellow and thick. Length %. 



Communicated by Mr. Tweedy, from the Ringed Plover 

 (Charadrius hiaticula). 



34. NIRMUS FUSCO-MARGINATUS. Denny. (Louse of the 

 Eared Grebe.) 



Plate X. Fig. 1. 



Pale testaceous-yellow, shining, smooth, and pubescent ; 

 head elongate, triangular, pale fulvous ; lateral margin of 

 the thorax and abdomen pitchy brown. 



Head large, sub-triangular, clypeus produced, with a sub- 

 quadrate depression anteriorly, lateral margin and two 

 diagonal lines from the antennae to the occiput deep chest- 

 nut, a depressed transverse line across the vertex; eyes 

 prominent ; antennae pale yellow, filiform, the second joint 

 much the longest; trabeculae very short and acute ; protho- 

 rax sub-conical, channelled in the centre, lateral margin 



